YAMATIC 3/4-inch Horizontal Pressure Washer Pump — 3200 PSI, 2.5 GPM Replacement

Overview

Give your pressure washer a new lease on life with the YAMATIC replacement pump. This horizontal unit uses a standard 3/4-inch shaft and supports up to 3200 PSI at 2.5 GPM, making it a versatile upgrade for many machines. Designed to fit a wide range of engines and brands, including Simpson, Honda, AR, and Karcher models, it’s a practical option when seals, pistons, or worn parts reduce performance. Replacing a worn pump can restore reliable power and efficiency without purchasing an entirely new unit.

Durability and adaptability

Engineered for outdoor use, the pump features a fully anodized die-cast aluminum body that resists rust and corrosion. A high-performance double seal system helps prevent leaks, while a refined piston and bearing setup supports steady pressure across longer cleaning sessions. The adjustable unloader lets you tune the pressure to match your engine’s output.

• Maintenance-free crankcase reduces routine service and simplifies upkeep.
• Durable construction supports frequent use across diverse tasks.
• Adjustable unloader enables flexible pressure management.

Real-world uses

From washing walls and fences to cleaning sidewalks, decks, and vehicles, this pump provides a reliable flow and consistent spray. With up to 3200 PSI and 2.5 GPM, it balances power with control for everyday cleaning jobs.

Installation, compatibility, and fit notes

The unit is designed to fit a range of popular models, including Simpson 90028/90029, MSH3125, 52004, Honda GC190/GC160, AR rmv 2.5g30, and various Karcher units. Important fit details include diagonal screw hole spacing of 3 5/8 inches, hole-to-hole spacing of 2 9/16 inches, a 3/16 inch key width, and a depth of 2 5/8 inches. Note: it will not fit 7/8 inch shaft engines; if you’re uncertain, contact us for confirmation.

What’s included

• Pump kit with 3/4-inch shaft
• Siphon tube with filter
• Mounting bolts
• Shaft key
• User instruction booklet

Quality, maintenance, and setup timing

Maintenance-free crankcase and an easy-start design help you bring your machine back online quickly. A typical setup takes about 5–10 minutes with the included hardware, making it convenient to salvage a worn power washer instead of replacing it.